[FEATURE]: more fork points

[DanielFGray]

Feature hasn't been suggested before.

• [x] I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

It'd be great to have more "fork points", it seems like currently I can only fork from my own messages, but being able to fork from messages from the model would also be useful too

[github-actions[bot]]

This issue might be a duplicate of existing issues. Please check:

• #1020: Feature: Visual Conversation Timeline for Navigation and Branching - This comprehensive proposal includes the exact functionality you're requesting - the ability to branch/fork from any point in conversation, including AI model messages
• #728: /fork - Discusses creating fork functionality for new sessions
• #1759: Fork session - Requests ability to duplicate current session state to new session
• #566: Editing / retrying messages in the history - Requests message forking/retrying functionality

Feel free to ignore if none of these address your specific case.